Powered by Precision. Trusted by Thousands.Certified Gemstone Testing & Grading You Can TrustGLK offers accurate gemstone identification and grading with 24-hour certified reporting. Trusted expertise meets advanced technology.Get Started +Years of Experience +Team Members %Satisfied Customer +Project Completed Our JourneyGLK means From Vision to Verification Crafting GLK’s Legacy in GemologyFrom humble beginnings in Kolkata, GLK